import datetime

from django.utils.deprecation import MiddlewareMixin
from web import models
from django.shortcuts import redirect
from django.conf import settings


class Tracer(object):
    def __init__(self):
        self.user = None
        self.price_policy = None
        self.project = None


class AuthMiddleware(MiddlewareMixin):
    def process_request(self, request):

        tracer_object = Tracer()

        """如果用户已登录，则request中赋值"""
        user_id = request.session.get("user_id", 0)
        user_object = models.UserInfo.objects.filter(id=user_id).first()
        tracer_object.user = user_object
        request.tracer = tracer_object

        # ###### 白名单，不用登录就可以访问的url###### #
        """
        1. 获取当前用户访问的url
        2. 检查URL是否在白名单中，如果在则可以继续访问，如果不在则进行判断是否已登录
        """
        if request.path_info in settings.WHITE_REGEX_URL_LIST:
            return
        # 检查用户是否已经登录，已登录继续往后走；未登录则返回登录界面
        if not request.tracer.user:
            return redirect('web:login')

        # 登陆成功之后，访问后台管理时：获取当前用户所拥有的额度

        # 方式一：免费额度在交易记录中存储
        _object = models.Transaction.objects.filter(user=user_object, status=2).order_by('-id').first()

        # 判断是否已过期
        current_datetime = datetime.datetime.now()
        if _object.end_datetime and _object.end_datetime < current_datetime:
            # 过期
            _object = models.Transaction.objects.filter(user=user_object, status=2, price_policy__category=1).first()

        tracer_object.price_policy = _object.price_policy
        # request.transaction = _object
        request.tracer = tracer_object

        # 方式二：免费的额度存储配置文件

    def process_view(self, request, view, args, kwargs):
        # 判断URL是否以manage开头，如果是则判断项目ID是否我创建or参与
        if not request.path_info.startswith('/manage/'):
            return

        project_id = kwargs.get('project_id')

        # 是否是我创建的
        project_object = models.Project.objects.filter(creator=request.tracer.user, id=project_id).first()
        if project_object:
            request.tracer.project = project_object
            return

        # 是否是我参与的项目
        project_user_object = models.ProjectUser.objects.filter(user=request.tracer.user, project_id=project_id)
        if project_user_object:
            request.tracer.project = project_user_object.project
            return

        return redirect('web:project_list')
